In the early days of print, you had to understand the tech to run the organization. (Ben Franklin, the man who made America a media hothouse, called himself Printer.) But in the 19th century, the printing press became domesticated. Printers were no longer senior figures — they became blue-collar workers. And the executive suite no longer interacted with them much, except during contract negotiations.
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Like all organizational models, waterfall is mainly a theory of collaboration. By putting the most serious planning at the beginning, with subsequent work derived from the plan, the waterfall method amounts to a pledge by all parties not to learn anything while doing the actual work. Instead, waterfall insists that the participants will understand best how things should work before accumulating any real-world experience, and that planners will always know more than workers.
Clay Shirky on Healthcare.gov